Board Thread:Traders' Board/@comment-31236952-20170517035013/@comment-27248965-20170526001937

There probably won't be Egg Sprites on Bulbapedia and Serebii.net because there aren't unique Egg Sprites in real Pokemon games. Well, except Manaphy. The developers created those unique Egg Sprites themselves, other than Manaphy Egg which is directly imported. Still, Bulbapedia and Serebii.net are enough to tell you that Legendary and Mythical Pokemon can NEVER breed, other than Sea Guardians.